针对太阳能光伏电池板并网发电转化效率较低的问题,提出了一种最大功率跟踪方法,并设计相应的最大功率跟踪控制器。该方法能够根据电网电压的幅值和频率变化,计算得到最大功率点修正量,并与扰动观察法得到的最大功率点叠加,完成最大功率点的跟踪控制。通过仿真实验表明:改进的方法能够有效避免误判,跟踪时间较短,在最大功率点附近的震荡减小。与一般扰动观察最大功率跟踪方法相比,该方法能够减弱电网不稳定因素对最大功率点的影响,获得更加准确的最大功率跟踪轨迹,满足电网稳定运行的最佳功率点。
According to the low conversion efficiency of photovoltaic panel,a new maximum power point tracking method was presented and the tracking controller of maximum power point was designed.The method could calculate maximum power point correction which was superposed to the power of maximum power point,and complete the maximum power point tracking control.Simulation results show that the improved method can avoid the misjudgment and have short tracking time and low oscillation.Compared with traditional perturbation and observation method,the new maximum power point tracking method can weak the influence of unstable factors on maximum power point.Meanwhile,it can achieve more accurate tracking of maximum power point and satisfy the best power point of power grid.